The luncheon suggestion for today from 365 Luncheon Dishes (from 1902) is Baked Beans and Tomato Salad: You have leftover baked beans (apparently plain ones); then you make a dressing (they call for 1 part vinegar, 2 parts oil, and some paprika), and stir some of it into the beans; then you place the dressed beans on a dish and surround them with tomato slices and then pour the rest of the dressing over everything.
For perhaps later in the day, one could celebrate national Popcorn Day!